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151 papers · 1 filter
Quantum gravity asymptotics from the SU(2) 15j symbol
John W. Barrett, Winston J. Fairbairn, Frank Hellmann
The asymptotics of the SU(2) 15j symbol are obtained using coherent states for the boundary data. The geometry of all non-suppressed boundary data is given. For some boundary data,…
Spectral properties of a resonator driven by a superconducting single-electron transistor
T. J. Harvey, D. A. Rodrigues, A. D. Armour
We analyze the spectral properties of a resonator coupled to a superconducting single electron transistor (SSET) close to the Josephson quasiparticle resonance. Focussing on the re…
The effect of kinematic constraints on multi-tension string network evolution
A. Avgoustidis, E. J. Copeland
We consider the evolution of a network of strings in an expanding universe, allowing for the formation of junctions between strings of different tensions. By explicitly including,…
The Geometry of Mass Outflows and Fueling Flows in the Seyfert 2 Galaxy Mrk 3
D. M. Crenshaw, S. B. Kraemer, H. R. Schmitt +4
We present a study of the resolved emission-line regions and an inner dust/gas disk in the Seyfert 2 galaxy Mrk 3, based on Hubble Space Telescope observations. We show that the ex…
Zone-plate focusing of Bose-Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components
T. E. Judd, R. G. Scott, G. Sinuco +4
We show that Fresnel zone plates, fabricated in a solid surface, can sharply focus atomic Bose-Einstein condensates that quantum reflect from the surface or pass through the etched…
Dissipation due to tunneling two-level systems in gold nanomechanical resonators
A. Venkatesan, K. J. Lulla, M. J. Patton +3
We present measurements of the dissipation and frequency shift in nanomechanical gold resonators at temperatures down to 10 mK. The resonators were fabricated as doubly-clamped bea…